NAVLE Bovine Herd Health Management 5

Question 1

A veterinarian is assessing a feedlot for bovine respiratory disease (BRD). Which scoring system is most widely used to objectively evaluate respiratory signs in individual cattle at the pen level?

Accepted Answer

Bovine Respiratory Disease Scoring System (BRDS) by McGuirk

Answer

The McGuirk Bovine Respiratory Disease Scoring System evaluates rectal temperature, nasal discharge, eye discharge, ear position, and head carriage to provide an objective BRD score for pull decisions.

Question 2

Pinkeye (infectious bovine keratoconjunctivitis) caused by Moraxella bovis is most prevalent in summer months. Which management practice MOST effectively reduces its spread in a beef herd?

Accepted Answer

Systemic antibiotic treatment of clinically affected animals and fly control

Answer

Prompt treatment of clinical cases with long-acting oxytetracycline combined with fly control (the primary vector for Moraxella bovis transmission) is the most effective two-pronged management approach.

Question 3

A cow presents with acute right-sided abomasal displacement progressing to volvulus (RDA/RAV) in a freshly calved dairy cow. Which finding on physical exam is most consistent with this diagnosis?

Accepted Answer

High-pitched ping over a large area on the right side between ribs 9-12, with signs of toxemia and tachycardia

Answer

Right abomasal volvulus produces a large-area right-sided ping (ribs 9-12), signs of severe toxemia, tachycardia, and rapid cardiovascular deterioration due to venous outflow obstruction.

Question 4

Bovine trichomoniasis (caused by Tritrichomonas foetus) is a venereal disease affecting beef cattle. Which control strategy is most effective in eliminating trichomoniasis from an infected beef herd?

Accepted Answer

Culling infected bulls and resting infected cows for 90+ days to allow self-clearance

Answer

Bulls are permanent carriers and cannot be treated; culling PCR-positive bulls and resting exposed cows (which self-clear in approximately 90 days of sexual rest) is the standard eradication approach.

Question 5

A veterinarian performing a herd health evaluation calculates the 21-day pregnancy rate for a dairy herd. Which formula correctly calculates 21-day pregnancy rate?

Accepted Answer

Conception rate × heat detection rate (or submission rate)

Answer

21-day pregnancy rate = conception rate × submission rate (heat detection rate), meaning it captures both the ability to detect cows in heat and the success of conception when bred.

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE Bovine Herd Health Management 5